"Panta Rhei" (everything flows) but how?

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Turbulent wake flow behind a circular cylinder

The website of Dr. Chiang Shih, a Professor and Chair of Mechanical Engineering Department, FAMU-FSU College of Engineering, is devoted to the regular pattern of vortices in the wake of a cylinder which is called a Karman vortex street. Well explained and graphically presented, including the animations of steaklines: